Although I like Mobileread (the site), I see myself mostly as an
anti-mobile user, lol.
In my view, laptop OSs offer many advantages over "strictly" mobile devices, such as the multitude of customisable and easily task-switchable software, while providing physical buttons/keyboards and wireless mouse input for added comfyness. Hardware-wise, though, mobile computers can be very challenging to customise and/or find a satisfactory combination of lightness, performance, screen resolution, screen panel type etc.
In fact, I read on the lappy so often that I need to remind myself to charge my mostly abandoned PW3 every now and then.